drawArc

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1 total messages Started by user Wed, 23 Mar 2005 04:08

#65

Author: user
Date: Wed, 23 Mar 2005 04:08

23 lines
1723 bytes

Hi everyone,

I am having a very strange problem with the method, drawArc.
The problem is that it does not produce a symmetrical ( and )
when they are supposed. Here is code to illustrate the problem.

    int px1=40,px2=7,py=40,wid=40,hit=24,
        bgnAng1=155,arcAng1=50,bgnAng2=25,arcAng2=-50;
    g.drawArc(px1,py,wid,hit,bgnAng1,arcAng1);
    g.drawArc(px2,py,wid,hit,bgnAng2,arcAng2);

As you draw them, you will see that there is 1 or 2 pixels
difference in their bottom/top (ie y) pixel addresses.

I suspect that some trancation in the points calculation
for ( and ) internally (ie within drawArc) is causing, but
at the same time, I am surprised to see such difference when
considering that such calculation must be done in double
precision internally...

Any idea?

Thank you very much.

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